A bunkie board is thin mattress support originally intended for a bunk bed.
It was invented in the early 20th century to provide a thinner platform support than box-springs, and more uniform support than slats.
[1] A DIY bunkie board might consist of 19 mm (3⁄4 in) plywood, but commercially-made versions can be made of wood or metal, and are often covered in fabric.
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